Abstract: Sliding wear performances of WC-Co coats was investigated through sliding wear abrasive test.The result shows that spraying parameters such as flow rate of O₂ and combusting gas C₃H₈ has influence on the wear weight loss of the coats.The failure of the coats in the process of sliding wear is characterized by cleavage crack.The peeling carbide particles is a dorminent fator to cause the wear of the coats in the course of failure.Binder phase,oxides and pores in the coats have a great influence on the extension of the crack.